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  <title>Document</title>
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  <div id="demo">
  <h2>1.class绑定：class='xxx'</h2>
  <p class="class" :class="myclas">xxxxx</p>
  <p class="{classB:hasB,classC:hasC}">yyyyy</p>
  <h2>2.style绑定</h2>
  <p ：>zzzzz</p>
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